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feat: add DataFrame.columns #3

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Merged
tswast merged 1 commit into from
Jul 14, 2025
Merged

feat: add DataFrame.columns #3

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5 changes: 5 additions & 0 deletions leanframe/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,5 +30,10 @@ def __init__(self, data):
else:
raise NotImplementedError("DataFrame constructor doesn't support local data yet.")

@property
def columns(self) -> pandas.Index:
"""The column labels of the DataFrame."""
return pandas.Index(self._data.columns, dtype="object")

def to_pandas(self) -> pandas.DataFrame:
return self._data.to_pandas()
5 changes: 5 additions & 0 deletions tests/unit/session/test_read_sql_table.py
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Expand Up @@ -16,6 +16,8 @@

import leanframe

import pandas.testing


def test_read_sql_table_can_convert_to_pandas(session: leanframe.Session):
"""Read a table with simple scalar values."""
Expand All @@ -26,3 +28,6 @@ def test_read_sql_table_can_convert_to_pandas(session: leanframe.Session):
# Make sure we have _some_ data.
assert len(df_pd.index) > 0
assert len(df_pd.columns) > 0

# Where possible, check that we are compatible with pandas.
pandas.testing.assert_index_equal(df_pd.columns, df_lf.columns)